funeral potatoes recipe

- 6 cups frozen hash brown potatoes (shredded or cubed) - 2 cups sour cream - 2 cups shredded cheddar cheese - 1 can (10.5 oz) condensed cream of chicken soup - 1/4 cup butter (melted) - 1/2 cup chopped onion (optional) - Salt and pepper to taste - 2 cups crushed cornflakes or breadcrumbs (for topping) - 1/4 cup butter (melted, for topping)